The problem with getting feedback from other developers is that they are far too nice. Developers know how hard it is to make a game, how much sweat and tears went into it, and they know what it's like to be on the receiving side of negative feedback. So, they are going to consistently pull their punches. If they think your game is complete and utter crap, they are going to express this in a diplomatic, roundabout way, like “It doesn't appeal to me” or “Your game looks boring”, or they are going to fixate on one minor issue that's relatively simple to fix, like the font.
If you want an honest appraisal of a game, go directly to the players. They are going to be far less nice. If you're lucky, they'll verbally abuse you. If you're unlucky, they'll just ignore you completely.